Clicking on the link the first time not only “accepts” the invite, it allows you to set your password. It also makes the link inoperative to further clicks. So if you did click on it, but didn’t fill in the password box, further clicking on it won’t work.
So do this to set your password:
- Choose LOGIN / LOGOUT, but don’t fill in the Username/Password boxes;
- Click on the “Lost your password?” link, which just requires your email address;
- On receipt of your password invite, click its link, which takes you to your Profile page;
- Enter a new password.